{
  "cveId": "CVE-2026-84383",
  "url": "https://patchblox.com/security/cve/CVE-2026-84383",
  "summary": "CVE-2026-84383 is fixed in libheif on 1 platform, first by DEBIAN-CVE-2026-84383, released September 5, 2026. It is not reported as exploited. Patch Radar priority: Urgent.",
  "title": "libheif: libheif is a HEIF and AVIF file format decoder and encoder",
  "description": "libheif is a HEIF and AVIF file format decoder and encoder. From 1.22.0 until 1.23.2, a crafted HEIF, HEIC, or AVIF item graph using nested iden and auxl references can make HeifPixelImage::transfer_channel_from_image_as() append duplicate Alpha planes with different bit depths to m_storage. HeifPixelImage::scale_nearest_neighbor() in libheif/image/pixelimage.cc allocates the destination Alpha plane using the first plane\u0027s 8-bit depth, then iterates a later 10-bit or 12-bit Alpha component and writes uint16_t samples into the same 8-bit allocation. The output geometry controls the overflow extent and the encoded sample values control the data written, allowing a remote file processed by heif_decode_image() to cause a heap out-of-bounds write. This issue is fixed in version 1.23.2.",
  "published": "2026-09-18T16:17:11Z",
  "severity": "critical",
  "cvss": 9.8,
  "cvssVector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
  "epss": 0.00717,
  "epssPercentile": 0.54086,
  "priority": "Urgent",
  "priorityTier": 2,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "libheif",
      "release": "Debian 14",
      "fixedVersion": "1.23.2-1",
      "fix": "DEBIAN-CVE-2026-84383",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-84383",
      "released": "2026-09-05T01:57:10Z"
    },
    {
      "platform": "linux",
      "product": "libheif",
      "release": "opensuse-leap 16.0",
      "fixedVersion": "1.23.4-160000.1.1",
      "fix": "OPENSUSE-SU-2026:21889-1",
      "url": "https://patchblox.com/security/fix/linux/opensuse-su-2026-21889-1",
      "released": "2026-09-20T12:44:23Z"
    },
    {
      "platform": "linux",
      "product": "libheif",
      "release": "sles 15.7",
      "fixedVersion": "1.23.4-150700.3.21.1",
      "fix": "SUSE-SU-2026:4276-1",
      "url": "https://patchblox.com/security/fix/linux/suse-su-2026-4276-1",
      "released": "2026-09-21T09:21:15Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-09T01:18:40Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}